CN101950966B - Dual-buck full-bridge parallel-connected active electric filter based on frequency multiplication SPWM (Sinusoidal Pulse Width Modulation) control - Google Patents
Dual-buck full-bridge parallel-connected active electric filter based on frequency multiplication SPWM (Sinusoidal Pulse Width Modulation) control Download PDFInfo
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Abstract
The invention discloses a dual-buck full-bridge parallel-connected active electric filter based on frequency multiplication SPWM (Sinusoidal Pulse Width Modulation) control, comprising a filter main circuit (1), a sampling circuit (2) and a control and drive circuit (3), wherein the control and drive circuit (3) comprises a reactive power detection loop (4), a voltage loop (5), a current loop (6) and a logic control and insulation driving loop (7), wherein the reactive power detection loop (4) carries out separation control on active power, harmonic waves and reactive power by utilizing a low pass filter so as to obtain harmonic waves and reactive currents; the voltage loop (5) and the current loop (6) are respectively used for stabilizing DC side capacitor voltages, tracking and compensating harmonic waves and reactive current references; and the logic control and insulation driving loop (7) distributes logic signals and generates drive signals. The invention can not only prevent AC side parallel-connected double-induction ring currents from existing, but also be beneficial to the enhancing of the equivalent switching frequency of a power tube, the alleviating of the contradiction of the capacity and the switching frequency of the power tube and the optimizing of the compensation characteristics of an active filter system.
Description
Technical field:
The present invention relates to a kind of two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control, belong to the power harmonic suppression technical field.
Background technology:
Along with the development of national economy and the progress of state-of-the-art technology, network load sharply increases, and the requirement of power network reactive power compensation is grown with each passing day.Particularly such as the continuous increase of the impacts such as milling train, arc furnace, nonlinear-load, add the generally application of power electronic technology, so that the problems such as voltage waveform distortion, voltage fluctuation flickering and three-phase imbalance have occured electrical network, produce the harmful effects such as the quality of power supply reduces, via net loss is serious.
Active Power Filter-APF is as one of humorous development trend that involves idle filtering device, its topological structure, humorously involves idle detection and Current Control Strategy has been subject to broad research.Relatively two kinds of Mainstream Packs Active Power Filter-APFs are topological---semi-bridge type and bridge-type structure, although half-bridge structure is simple in structure, control easily, but it is low to show the dc capacitor voltage utilance, compensation characteristic is general, the very important shortcomings such as power device voltage capacity class requirement height, so that the bridge-type topology has more advantage, more the researcher pays close attention to.For the system reliability of the Active Power Filter-APF that improves the bridge-type topological structure, control drives link unavoidably need to increase certain Dead Time, affects compensation performance.And along with the increase of switching frequency, the compensation performance of Active Power Filter-APF can get a promotion.Therefore when solving jumbo mains by harmonics and reactive power compensation problem, often take the means such as plural parallel stage or cascade to alleviate the contradiction of power tube switching frequency on capacity, in order to obtain more excellent compensation characteristic, this can bring the more complicated of the increase of cost and control.The power tube control of two step-down full-bridge parallel connection type active electric filters does not need Dead Time, can stop the bridge arm direct pass problem fully, improve system reliability, the power tube body diode peels off simultaneously, reduced the power tube switching loss, the raising of useful switching frequency.The control strategy of the bridge-type structure of routine is applied to two step-down full-bridge parallel connection type active electric filters can cause inductance circulation to occur, although the compensation characteristic impact on Active Power Filter-APF is little, but can bring unnecessary loss, consider that system security reliability does not allow yet.Therefore how to reduce the running wastage of two step-down full-bridge parallel connection type active electric filters, improve its unit efficiency, avoid the overheated problem such as device security that causes that certain realistic meaning is arranged.The Control Strategy for Active Power Filters of considering the bridge-type structure has adopted frequency doubling technology, be conducive to improve the power tube equivalent switching frequency, thereby bring the advantage of filtering characteristic, although two step-down full-bridge parallel connection type active electric filters have its special construction, it is equally very important to its practical application how to introduce this advanced technology.
Summary of the invention
Goal of the invention:
The object of the invention is to take two step-down full-bridge parallel connection type active electric filters as object, deficiency for its control technology existence, a kind of SPWM half-wave frequency multiplication control system is proposed, AC two inductance circulation sides in parallel exist when avoiding Active Power Filter-APF work, and can alleviate the contradiction of power tube switching frequency and capacity, be conducive to reduce the active filter system loss, improve system effectiveness and filtering performance.
Technical scheme:
The present invention adopts following technical scheme for achieving the above object:
A kind of two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control comprise filter main circuit, sample circuit and control and drive circuit; The input of described filter main circuit is connected with an end of electrical network positive bus-bar, nonlinear load respectively, the output of filter main circuit is connected with the other end of nonlinear load, the negative busbar of electrical network respectively, the input of sample circuit is connected with filter main circuit, grid side circuit respectively, is used for gathering the sampled value of electric current, voltage; Control and drive circuit comprise idle detection ring, Voltage loop, electric current loop, logic control and isolation drive ring; Wherein the first input end of the input of the first input end of idle detection ring, Voltage loop, electric current loop is connected with the output of sample circuit respectively; The output of Voltage loop is connected with the second input of idle detection ring, and the output of idle detection ring is connected with the second input of electric current loop; The output andlogic control of electric current loop and isolation drive ring input connect, and the output of logic control and isolation drive ring is connected with the filter main circuit.
Further, the filter main circuit of above-mentioned two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control comprises AC inductance in parallel, first single power tube brachium pontis, the second single power tube brachium pontis and dc bus capacitor; Wherein the AC inductance in parallel comprises the first inductance, the second inductance, the 3rd inductance, the 4th inductance; Described first single power tube brachium pontis, second single power tube brachium pontis comprise respectively the brachium pontis of two parallel connections; Wherein an end of an end of the first inductance, the second inductance links to each other as the positive input terminal of filter main circuit, the other end of the first inductance links to each other with the mid point of arbitrary brachium pontis in first single power tube brachium pontis, and the other end of the second inductance links to each other with the mid point of arbitrary brachium pontis in second single power tube brachium pontis; One end of the 3rd inductance, an end of the 4th inductance link to each other as the negative output terminal of filter main circuit, the mid point of another brachium pontis in the other end of the 3rd inductance and the first single power tube brachium pontis links to each other, and the mid point of another brachium pontis in the other end of the 4th inductance and the second single power tube brachium pontis links to each other; The two ends of described dc bus capacitor connect respectively the positive and negative dc bus of filter main circuit;
Described sample circuit comprises load current sampling CT1, offset current sampling CT2 and line voltage sampling VT1, dc capacitor voltage sampling VT2; The sampled value of wherein said dc capacitor voltage sampling VT2 inputs to the input of Voltage loop; The sampled value difference input harmonics of the sampled value of described load current sampling CT1, line voltage sampling VT1 and the first input end of idle testing circuit; The first input end of the sampled value input current ring of described offset current sampling CT2.
Further, the first brachium pontis of first single power tube brachium pontis of above-mentioned two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control comprises the first power tube, the first diode, and the second brachium pontis comprises the 3rd power tube, the 3rd diode; Wherein the source electrode of the first power tube links to each other with the negative electrode of the first diode, and the source electrode of the 3rd power tube links to each other with the negative electrode of the 3rd diode;
The first brachium pontis of described second single power tube brachium pontis comprises the second power tube, the second diode, and the second brachium pontis comprises the 4th power tube, the 4th diode; The anodic bonding of the drain electrode of the second power tube and the second diode wherein, the anodic bonding of the drain electrode of the 4th power tube and the 4th diode;
The negative electrode of the negative electrode of the drain electrode of the first power tube, the 3rd power tube, the second diode, the 4th diode is connected with the direct current positive bus of filter main circuit respectively, and the anode of the source electrode of the source electrode of the second power tube, the 4th power tube, the first diode, the 3rd diode is connected with the direct current negative busbar of filter main circuit respectively.
Further, the Voltage loop of above-mentioned two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control comprises the 3rd subtracter, voltage regulator; Wherein the sampled value of dc voltage reference value, dc capacitor voltage sampling VT2 is inputted respectively the positive and negative input of described the 3rd subtracter, the output output voltage error value of the 3rd subtracter inputs to the input of voltage regulator, and the output of voltage regulator is connected with humorous the second input that involves idle testing circuit.
Further, above-mentioned two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control humorous involves idle detection ring and comprises the first multiplier, low pass filter, adder, the second multiplier, the second subtracter, phase-locked loop, proportionality coefficient adjuster; The input of wherein said the first multiplier is as the humorous first input end that involves idle detection ring, and the output of the first multiplier connects the input of low pass filter; The output of low pass filter is connected with the first input end of adder, and the second input of adder is connected with the output of Voltage loop as humorous the second input that involves idle testing circuit; The output of adder connects the input of proportionality coefficient adjuster, and the output of proportionality coefficient adjuster connects the first input end of the second multiplier; Obtain the second input that the Synchronism Unit line voltage is inputted the second multiplier behind the sampled value input phase-locked loop of line voltage VT1; The output of the second multiplier connects the positive input terminal of the second subtracter; The sampled value of load current CT1 is inputted the negative input end of the second subtracter; The output of the second subtracter is as the humorous output that involves idle detection ring, and output harmonic wave and reactive current are connected with the second input of electric current loop.
Further, the electric current loop of above-mentioned two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control comprises the 4th subtracter, current regulator, zero-crossing comparator, the second comparator and the 3rd comparator; Wherein humorously involve the output of idle detection ring, the sampled value of offset current CT2 connects respectively the positive and negative input of the 4th subtracter; The output of the 4th subtracter connects the input of current regulator; The output of current regulator accesses respectively the positive input terminal of the second comparator, the 3rd comparator, and the negative input end of the second comparator, the 3rd comparator connects respectively the anti-phase triangular carrier of equifrequency constant amplitude; The positive input termination harmonic wave of zero-crossing comparator and the output of idle detection ring;
The output difference andlogic control of zero-crossing comparator, the second comparator, the 3rd comparator and the input of isolation drive ring connect.
Further, the logic control of above-mentioned two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control and isolation drive ring comprise three not gates, four with and four isolation drive; Wherein three not gates are respectively the first not gate, the second not gate, the 3rd not gate, four with the door be respectively first with the door, second with the door, the 3rd with the door, the 4th with, four isolation drive are respectively the first isolation drive, the second isolation drive, the 3rd isolation drive, the 4th isolation drive;
The output of wherein said zero-crossing comparator is connected with the input of door with door, the 3rd with the first not gate, second respectively; The output of described the second comparator is connected with the input of door with the second not gate, the 3rd respectively; The output of described the 3rd comparator respectively the 3rd not gate, second is connected with the input of door; The output of described the first not gate is connected with the input of door with door, the 4th with first respectively; The output of described the second not gate connect the 4th with the input of door, the output of described the 3rd not gate connect first with the input of door; Described four outputs with door are connected respectively the input of described four isolation drive, and the output of described four isolation drive is four power tubes of output drive signal to the filter main circuit respectively.
Beneficial effect:
1, topological structure of the present invention is simple, and control is easy to realize easily;
2, single tube bridge arm structure of the present invention is separated body diode from power tube, can distinguish optimizing power switching tube and power diode, creates conditions for further improving switching frequency, in order to improve filter harmonic compensation characteristic;
3, the present invention can stop the danger of bridge arm direct pass with respect to traditional parallel connection type active electric filter, and system reliability is high;
4, the present invention can avoid the generation of circulation between AC two inductance in parallel, reduces the active filter system loss, improves system effectiveness; The actual switch frequency is constant, improves equivalent switching frequency, has optimized the Active Power Filter-APF compensation characteristic.
Description of drawings:
Fig. 1 is the structural representation of the two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control of the present invention.
The control principle schematic diagram of Fig. 2 single-phase pair of step-down full-bridge parallel connection type active electric filter of the present invention.
Fig. 3 is the simulation waveform of the present invention's load current, offset current, power network current and line voltage of being applied to the 115V/400Hz electrical network.
Fig. 4 is driving signal and the inductive current simulation waveform that the present invention is applied to the 115V/400Hz electrical network.
Number in the figure: 1, filter main circuit, 2, sample circuit, 3, control and drive circuit, 4, humorously involve idle detection ring, 5, Voltage loop, 6, electric current loop, 7, logic control and isolation drive ring.
Specific embodiments:
Be described in further detail below in conjunction with the enforcement of accompanying drawing to technical scheme:
As shown in Figure 1, Active Power Filter-APF of the present invention comprises filter main circuit 1, sample circuit 2 and control and drive circuit 3; Filter main circuit 1 is connected with electrical network, and the input of sample circuit 2 is connected with filter main circuit 1, grid side circuit respectively, is used for gathering the sampled value of electric current, voltage; Control and drive circuit 3 comprise idle detection ring 4, Voltage loop 5, electric current loop 6, logic control and isolation drive ring 7; Wherein the first input end of the input of the first input end of idle detection ring 4, Voltage loop 5, electric current loop 6 is connected with the output of sample circuit 2 respectively; The output of Voltage loop 5 is connected with the second input of idle detection ring 4, and the output of idle detection ring 4 is connected with the second input of electric current loop 6; The output andlogic control of electric current loop 6 and isolation drive ring 7 inputs connect, and the output of logic control and isolation drive ring 7 is connected with filter main circuit 1.
As shown in Figure 2, the control principle schematic diagram of single-phase pair of step-down full-bridge parallel connection type active electric filter of the present invention, main circuit 1 is by two groups of ACs two inductance L in parallel
1And L
2, L
3And L
4, four groups of single power tube brachium pontis S
1D
1, S
2D
2, S
3D
3, S
4D
4And dc bus capacitor (C).Sample circuit 2 comprises load current sampling CT1, offset current sampling CT2 and line voltage sampling VT1, dc capacitor voltage sampling VT2.Control and drive circuit 3 comprise humorous idle detection ring 4, Voltage loop 5, electric current loop 6 and logic control and the isolation drive ring 7 of involving, and humorously involve idle detection ring 4 and are input as Voltage loop 5 output, CT1 load current sampled value i
LWith VT1 line voltage sampled value u
S, its output access electric current loop 6; Electric current loop 6 is input as humorous idle testing circuit 4 output and the CT2 sampled values that involve, and three signals of its output access respectively logic control and isolation drive ring 7; Logic control and isolation drive ring 7 are input as 6 three output signals of electric current loop, its output access main circuit 1 power tube grid.
Humorously involve idle detection ring 4 and utilize the instantaneous power algorithm, with CT1 load current sampled value i
LWith VT1 line voltage sampled value u
SInput multiplier M
1, the output loading instantaneous power is then through obtaining instantaneous active power after low pass filter LPF filtering instantaneous reactive and the harmonic power, with low pass filter LPF output access adder B
1One of input another input meets Voltage loop 5 outputs, adder B
1Proportional coefficient K (K power taking net voltage max U is multiply by in output
M2 times reciprocal) after the fundamental active current effective value that obtains, as multiplier M
2An input, VT1 line voltage sampled value u
SObtain the Synchronism Unit line voltage as multiplier M behind the input phase-locked loop pll
2Another input, multiplier M
2Be output as fundamental active current, with itself and CT1 load current sampled value i
LAccess respectively subtracter B
2Positive negative input, subtracter B
2Be output as the humorous reactive current that involves, i.e. the offset current benchmark.
In the Voltage loop 5, subtracter B
3Positive negative input connects respectively dc voltage with reference to V
RefWith VT2 dc capacitor voltage sampled value V
C, subtracter B
3Output voltage error access voltage regulator PI, voltage regulator PI exports as adder B
1Another input is to keep dc capacitor voltage constant.
In the electric current loop 6, subtracter B
4Positive negative input meets respectively humorous idle detection ring 4 output and the CT2 offset current sampled value i that involve
C, subtracter B
4Output offset current error access current regulator P, current regulator P output modulating wave accesses respectively comparator J
2With comparator J
3Positive input, two comparator negative inputs connect respectively the anti-phase triangular carrier of equifrequency constant amplitude, respectively with the relatively rear comparator J of modulating wave
3Power output pipe S
1And S
2The SPWM control signal, comparator J
2Power output pipe S
3And S
4The SPWM control signal; Zero-crossing comparator J
1Positive input connects humorous idle detection ring 4 outputs, the output half-wave logic control signal of involving.
Logic control and isolation drive ring 7 produce and drive signal, as zero-crossing comparator J in order to distribute the SPWM signal
1Output half-wave logic control signal (polarity of offset current benchmark is greater than zero) greater than zero time, zero-crossing comparator J
1Output access not gate F
1Rear generation signal will with door Y
1With with door Y
4Signal blocks, only power ratio control pipe S
2And S
3Otherwise, as zero-crossing comparator J
1When output half-wave logic control signal equals zero (polarity of offset current benchmark is less than zero), zero-crossing comparator J
1Output will with door Y
2And Y
3Signal blocks, only power ratio control pipe S
1And S
4Comparator J
2Output accesses respectively not gate F
2With with door Y
3, not gate F
2Output access and door Y
4Comparator J
3Output accesses respectively not gate F
3With with door Y
2, not gate F
3Output access and door Y
1With door Y
1, Y
2, Y
3, Y
4Output meets respectively isolation drive DR
1, DR
2, DR
3, DR
4, obtain at last power tube S in the filter main circuit 1
1, S
2, S
3, S
4The driving signal.
SPWM half-wave frequency multiplication controlling party ratio juris of the present invention is to make two step-down full-bridge parallel connection type active electric filters be operated in two kinds of operation modes: at offset current greater than zero the time, brachium pontis S
2D
2And S
3D
3Participation work; At offset current less than zero the time, brachium pontis S
1D
1And S
4D
4Participation work, two kinds of complementary work of mode.Current Control Strategy adopts the SPWM control mode, and it is constant that modulating wave remains, brachium pontis S
1D
1And S
2D
2Modulation share a triangular carrier, S
3D
3And S
4D
4Modulation share the another one triangular carrier, two same of same frequencies of triangular carrier are anti-phase, so that all can occur three current potentials of the positive and negative dc voltage of zero-sum in the every half-wave of offset current, the actual switch frequency is constant, increase equivalent switching frequency, be conducive to improve the compensation characteristic of Active Power Filter-APF.
Accompanying drawing 4 is driving signal and inductive current simulation waveforms that the present invention is applied to the 115V/400Hz electrical network.Electric current by driving and inductance can learn that each brachium pontis all only in the complementary work of offset current unipolarity half-wave, the circulation situation can not occur.
Single-phase pair of step-down full-bridge parallel connection type active electric filter is applied to the 115V/400Hz electrical network, Current Control Strategy adopts respectively SPWM half-wave control technology of the present invention and SPWM half-wave frequency multiplication control technology, power network current waveform THD after the compensation is compared discovery: after adopting two kinds of control modes, the humorous reactive current that involves has all obtained better compensation, but adopt the power network current THD value of SPWM half-wave frequency multiplication control technology of the present invention to be better than the former, be respectively 5.21% and 2.75%.
Simulation result shows: the present invention can better realize power network harmonic wave management, reduces the loss of active power filtering system, and can improve its filter effect.
Claims (5)
1. the two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control comprise filter main circuit (1), sample circuit (2) and control and drive circuit (3); The input of described filter main circuit (1) is connected with an end of electrical network positive bus-bar, nonlinear load respectively, the output of filter main circuit (1) is connected with the other end of nonlinear load, the negative busbar of electrical network respectively, the input of sample circuit (2) is connected with filter main circuit (1), grid side circuit respectively, is used for gathering the sampled value of electric current, voltage; It is characterized in that: described control and drive circuit (3) comprise idle detection ring (4), Voltage loop (5), electric current loop (6), logic control and isolation drive ring (7); Wherein the first input end of the input of the first input end of idle detection ring (4), Voltage loop (5), electric current loop (6) is connected with the output of sample circuit (2) respectively; The output of Voltage loop (5) is connected with the second input of idle detection ring (4), and the output of idle detection ring (4) is connected with the second input of electric current loop (6); The output andlogic control of electric current loop (6) and isolation drive ring (7) input connect, and the output of logic control and isolation drive ring (7) is connected with filter main circuit (1);
Described filter main circuit (1) comprises AC inductance in parallel, first single power tube brachium pontis, the second single power tube brachium pontis and dc bus capacitor C; Wherein the AC inductance in parallel comprises the first inductance L
1, the second inductance L
2, the 3rd inductance L
3, the 4th inductance L
4Described first single power tube brachium pontis, second single power tube brachium pontis comprise respectively the brachium pontis of two parallel connections; The first inductance L wherein
1An end, the second inductance L
2An end link to each other as the positive input terminal of filter main circuit (1), the first inductance L
1The other end and first single power tube brachium pontis in the mid point of arbitrary brachium pontis link to each other the second inductance L
2The other end link to each other with the mid point of arbitrary brachium pontis in second single power tube brachium pontis; The 3rd inductance L
3An end, the 4th inductance L
4An end link to each other as the negative output terminal of filter main circuit (1), the 3rd inductance L
3The other end and first single power tube brachium pontis in the mid point of another brachium pontis link to each other the 4th inductance L
4The other end and second single power tube brachium pontis in the mid point of another brachium pontis link to each other; The two ends of described dc bus capacitor C connect respectively the positive and negative dc bus of filter main circuit (1);
Described sample circuit (2) comprises load current sampling CT1, offset current sampling CT2 and line voltage sampling VT1, dc capacitor voltage sampling VT2; The sampled value (Vc) of wherein said dc capacitor voltage sampling VT2 inputs to the input of Voltage loop (5); Sampled value (the i of described load current sampling CT1
L), the sampled value (u of line voltage sampling VT1
S) input respectively the first input end of idle detection ring (4); The first input end of sampled value (ic) the input current ring (6) of described offset current sampling CT2;
Described idle detection ring (4) comprises the first multiplier (M
1), low pass filter (LPF), adder (B
1), the second multiplier (M
2), the second subtracter (B
2), phase-locked loop (PLL), proportionality coefficient adjuster (K); Wherein said the first multiplier (M
1) input as the first input end of idle detection ring (4), the first multiplier (M
1) output connect the input of low pass filter (LPF); The output of low pass filter (LPF) and adder (B
1) first input end connect adder (B
1) the second input be connected with the output of Voltage loop (5) as the second input of idle detection ring (4); Adder (B
1) output connect the input of proportionality coefficient adjuster (K), the output of proportionality coefficient adjuster (K) connects the second multiplier (M
2) first input end; Sampled value (the u of line voltage VT1
S) obtain the Synchronism Unit line voltage after input phase-locked loop (PLL) and input the second multiplier (M
2) the second input; The second multiplier (M
2) output connect the second subtracter (B
2) positive input terminal; Sampled value (the i of load current CT1
L) input the second subtracter (B
2) negative input end; The second subtracter (B
2) output as the output of idle detection ring (4), output harmonic wave and reactive current are connected with the second input of electric current loop (6).
2. two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control according to claim 1, it is characterized in that: the first brachium pontis of described first single power tube brachium pontis comprises the first power tube S
1, the first diode D
1, the second brachium pontis comprises the 3rd power tube S
3, the 3rd diode D
3The first power tube S wherein
1Source electrode and the first diode D
1Negative electrode link to each other the 3rd power tube S
3Source electrode and the 3rd diode D
3Negative electrode link to each other;
The first brachium pontis of described second single power tube brachium pontis comprises the second power tube S
2, the second diode D
2, the second brachium pontis comprises the 4th power tube S
4, the 4th diode D
4The second power tube S wherein
2Drain electrode and the second diode D
2Anodic bonding, the 4th power tube S
4Drain electrode and the 4th diode D
4Anodic bonding;
The first power tube S
1, the 3rd power tube S
3Drain electrode, the second diode D
2Negative electrode, the 4th diode D
4Negative electrode be connected the second power tube S with the direct current positive bus of filter main circuit (1) respectively
2Source electrode, the 4th power tube S
4Source electrode, the first diode D
1, the 3rd diode D
3Anode be connected with the direct current negative busbar of filter main circuit (1) respectively.
3. two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control according to claim 1, it is characterized in that: described Voltage loop (5) comprises the 3rd subtracter (B
3), voltage regulator (PI); Dc voltage reference value (V wherein
Ref), the sampled value (Vc) of dc capacitor voltage sampling VT2 inputs respectively described the 3rd subtracter (B
3) positive and negative input, the 3rd subtracter (B
3) output output voltage error value input to the input of voltage regulator (PI), the output of voltage regulator (PI) is connected with the second input of idle detection ring (4).
4. two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control according to claim 1, it is characterized in that: described electric current loop (6) comprises the 4th subtracter (B
4), current regulator (P), zero-crossing comparator (J
1), the second comparator (J
2) and the 3rd comparator (J
3); Sampled value (the i of the output of idle detection ring (4), offset current CT2 wherein
C) connect respectively the 4th subtracter (B
4) positive and negative input; The 4th subtracter (B
4) output connect the input of current regulator (P); The output of current regulator (P) accesses respectively the second comparator (J
2), the 3rd comparator (J
3) positive input terminal, the second comparator (J
2), the 3rd comparator (J
3) negative input end connect respectively the anti-phase triangular carrier of equifrequency constant amplitude; Zero-crossing comparator (J
1) the output of the idle detection ring of positive input termination (4);
Zero-crossing comparator (J
1), the second comparator (J
2), the 3rd comparator (J
3) output respectively the input of andlogic control and isolation drive ring (7) connect.
5. two step-down full-bridge parallel connection type active electric filters based on frequency multiplication SPWM control according to claim 4 is characterized in that: described logic control and isolation drive ring (7) comprise three not gates, four with and four isolation drive; Wherein three not gates are respectively the first not gate F
1, the second not gate F
2, the 3rd not gate F
3, four with the door be respectively first with the door Y
1, second and the door Y
2, the 3rd with the door Y
3, the 4th with the door Y
4, four isolation drive are respectively the first isolation drive DR
1, the second isolation drive DR
2, the 3rd isolation drive DR
3, the 4th isolation drive DR
4
Wherein said zero-crossing comparator (J
1) output respectively with the first not gate F
1, second and the door Y
2, the 3rd with the door Y
3Input connect; Described the second comparator (J
2) output respectively with the second not gate F
2, the 3rd with the door Y
3Input connect; Described the 3rd comparator (J
3) output the 3rd not gate F respectively
3, second and the door Y
2Input connect; Described the first not gate F
1Output respectively with first with the door Y
1, the 4th with the door Y
4Input connect; Described the second not gate F
2Output connect the 4th with the door Y
4Input, described the 3rd not gate F
3Output connect first with a door Y
1Input; Described four outputs with door are connected respectively the input of described four isolation drive, and the output of described four isolation drive is four power tubes of output drive signal to the filter main circuit (1) respectively.
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| CN2010102551852A CN101950966B (en) | 2010-08-17 | 2010-08-17 | Dual-buck full-bridge parallel-connected active electric filter based on frequency multiplication SPWM (Sinusoidal Pulse Width Modulation) control |
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| CN101950966B true CN101950966B (en) | 2013-02-13 |
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| CN107222120B (en) * | 2017-07-13 | 2019-08-30 | 南京航空航天大学 | The suppressing method of the double buck gird-connected inverter current over-zero distortion of three-phase |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055991A (en) * | 2006-04-14 | 2007-10-17 | 广东工业大学 | 380V system active power filtering device |
| CN201758283U (en) * | 2010-08-17 | 2011-03-09 | 南京航空航天大学 | Active power filter based on SPWM half-wave frequency doubling control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055991A (en) * | 2006-04-14 | 2007-10-17 | 广东工业大学 | 380V system active power filtering device |
| CN201758283U (en) * | 2010-08-17 | 2011-03-09 | 南京航空航天大学 | Active power filter based on SPWM half-wave frequency doubling control |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2004-248383A 2004.09.02 |
| 吴婷.一种新颖双降压式全桥逆变器.《2008年中国电工技术学会电力电子学会第十一届学术年会》.2008,正文第2-3栏及图1. * |
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